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In a photo from Thursday, March 8, 2018, in Detroit, Alondra Alvarez, a student at Western International High School, goes through a metal detector and has her backpack checked as she enters the school. Experts say metal detectors and other security measures put in place decades ago to quell gang and other violence in many urban schools have made them tough targets for mass shootings by troubled students or outsiders. (AP Photo/Carlos Osorio)

In a photo from Thursday, March 8, 2018, in Detroit, Alondra Alvarez, a student at Western International High School, goes through a metal detector and has her backpack checked as she enters the school. Experts say metal detectors and other security measures put in place decades ago to quell gang and other violence in many urban schools have made them tough targets for mass shootings by troubled students or outsiders. (AP Photo/Carlos Osorio)

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